Ingredients

A pharmacist-led guide to cosmetic actives. Every ingredient explained with scientific evidence: what it does, how to use it and what to combine it with.

Cyclopentasiloxane for Skin: What to Expect and What Not To
anti-inflammatory
Cyclopentasiloxane for Skin: What to Expect and What Not To
I'll explain what cyclopentasiloxane is, what it's used for in cosmetics, its safety, if it's safe during pregnancy, ...
Published: 13 May 2026
Apple Stem Cells: Real Benefits and How to Use Them Properly
anti-inflammatory
Apple Stem Cells: Real Benefits and How to Use Them Properly
Apple stem cells in cosmetics do not regenerate your skin like a living cell, but they can help protect it from oxida...
Published: 13 May 2026
Pentylene Glycol: What It Does For Your Skin And How To Make The Most Of It
antimicrobial
Pentylene Glycol: What It Does For Your Skin And How To Make The Most Of It
Pentylene glycol helps maintain hydration and improves formula preservation. I'll tell you what it actually does for ...
Published: 13 May 2026
Horse chestnut: uses, precautions, and combinations
anti-inflammatory
Horse chestnut: uses, precautions, and combinations
Horse chestnut is primarily used for its calming, antioxidant, and decongestant effects. I'll tell you what the evide...
Published: 13 May 2026
Devil's Claw extract in your routine: when yes and when no
anti-inflammatory
Devil's Claw extract in your routine: when yes and when no
I'll explain what harpagophytum extract is, what real benefits it can bring to the skin, what precautions you should ...
Published: 12 May 2026
Glycerin: What it's for and how to use it on your skin
hydrating
Glycerin: What it's for and how to use it on your skin
Glycerin is one of the most effective and best-tolerated humectants. I'll explain what it's used for, how to use it, ...
Published: 12 May 2026
Climbazole in cosmetics: benefits and when to use it
hair-repair
Climbazole in cosmetics: benefits and when to use it
Pharmaceutical guide on climbazole: what it is, when it makes sense to use it for dandruff and seborrheic dermatitis,...
Published: 12 May 2026
Hydrolyzed collagen: what it does for your skin and how to get the most out of it
hair-repair
Hydrolyzed collagen: what it does for your skin and how to get the most out of it
I'll explain what hydrolyzed collagen can and cannot do in cosmetics, for which skin types it makes sense, and how to...
Published: 12 May 2026
What is zinc PCA for? A pharmacist explains it to you
antimicrobial
What is zinc PCA for? A pharmacist explains it to you
Zinc PCA helps control excess sebum and can support acne-prone skin. I'll tell you what the evidence says, how to use...
Published: 12 May 2026
Snail mucin in your routine: when to use it and when not to
hydrating
Snail mucin in your routine: when to use it and when not to
Snail mucin can help hydrate, soothe, and improve skin recovery. I'll explain what the evidence says, who it makes se...
Published: 11 May 2026
Inulin: What it does for your skin and how to make the most of it
anti-inflammatory
Inulin: What it does for your skin and how to make the most of it
Inulin is a cosmetic prebiotic that helps strengthen the skin barrier, improve hydration, and soothe sensitive skin w...
Published: 11 May 2026
What does urea do to your skin? I'll tell you.
exfoliant
What does urea do to your skin? I'll tell you.
Urea hydrates, softens flaking, and helps repair the skin barrier. The key is to use the appropriate concentration de...
Published: 11 May 2026

What are cosmetic active ingredients

Cosmetic active ingredients are the components responsible for making a product do what it promises. Unlike excipients (which provide texture, preservation or fragrance), actives are the ones that produce a real, measurable effect on the skin: stimulating collagen, inhibiting melanin, strengthening the skin barrier or accelerating cell renewal.

The problem is that most brands do not explain which actives they use, at what concentration or why. This pharmacist-led guide to cosmetic ingredients was created to change that: each article analyses an active ingredient with the available scientific evidence, without exaggeration or empty promises.

How to use this ingredient guide

Each article in this guide includes a summary card with the INCI name, effective concentration, potency, recommended skin type, routine step and compatibility with other actives. You will also find information on use during pregnancy and verifiable scientific references.

All content is written and reviewed by a licensed pharmacist with over 20 years of experience. This is not a standard cosmetic ingredient list — it is a professional guide designed to help you make informed decisions about your skincare.

Arancha Grediaga
Author and reviewer
Pharmacist · Dermocosmetics Expert · COFA License #6497
+20 years of community pharmacy experience · Technical Lead at EVUE Cosmetics